Sorry no, that doesn’t happen until about 40,000 feet. Thats why they put those oxygen mask thingies on these planes. Because people have time to get them. Their eardrums might blow out and they’d certainly get dizzy but they would not suddenly black out.
Within a minute they’d be below 25,000 feet and able to breath.
Not true. The “time to get to the oxygen masks” scenario happens when there is a gradual decompression (due to a door seal blow-out or whatever), not an instantaneous loss of all cabin pressure. Even at Mt. Everest elevation you would lose consciousness if subjected to that instantaneously. The gradual vs. sudden nature of the loss is very important. Many people have climbed Everest without supplemental oxygen but not without long, long acclimatization.